Multi-TRP PDSCH Joint Detection for URLLC Reliability
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Solution Overview
Problem
Current wireless communication technologies face challenges in achieving high-performance transmission while managing complex processing requirements, especially in multi-transmission reception points (TRPs) for ultra-reliable low-latency communication (URLLC) services, where user equipment (UE) must handle multiple transport blocks from different base stations, leading to increased power consumption and complexity.
Innovation Solution
The proposed solution involves using explicit downlink control information (DCI) bits to indicate whether multiple physical downlink shared channels (PDSCHs) are associated, allowing user equipment (UE) to perform combined detection and feedback, and dynamically switching between multi-TRP and single TRP transmission to enhance reliability and capacity by scheduling transport blocks (TBs) based on signal-to-noise ratio (SNR) conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transport blocks are transmitted from different base stations, then transmission reliability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines multiple transport blocks into a single codeblock group for joint processing. The UE performs combined detection and feedback on multiple PDSCHs, treating them as a unified entity rather than separate independent blocks, thereby reducing processing complexity while maintaining reliability benefits
Solution Approach 2:
The patent creates a universal feedback mechanism where a single NACK feedback can trigger retransmission of the entire codeblock group from any TRP. This multi-functional approach allows the system to handle multiple transmission scenarios (single TRP, multiple TRPs, different codeblock groups) through a unified feedback protocol, reducing device complexity
2Reliability
If multiple transport blocks are transmitted from different base stations, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
By merging multiple PDSCH receptions into a single codeblock group with joint processing, the UE reduces the number of separate detection and feedback operations needed. This consolidation lowers computational power consumption while preserving the reliability advantages of multi-TRP transmission
Solution Approach 2:
The patent uses codeblock copying where the same codeblock is transmitted across multiple TRPs. The UE can successfully decode the data from any one copy, reducing the need for extensive processing of multiple independent blocks and thereby lowering power consumption
3Device complexity
If explicit DCI bits are used to indicate PDSCH association, then processing complexity is reduced, but control information overhead increases
Solution Approach 1:
The patent extracts the association indication from complex scheduling parameters and implements it through dedicated explicit DCI bits. This separation allows the UE to quickly determine PDSCH grouping without processing complex relationships between multiple scheduling parameters, reducing processing complexity despite adding control overhead
Solution Approach 2:
The patent applies local quality by using explicit DCI bits only where needed - specifically for indicating PDSCH association in multi-TRP scenarios. In single-TRP cases, the simpler existing mechanisms remain in use, optimizing the balance between overhead and complexity reduction locally rather than globally
4Reliability
If combined detection and feedback is performed, then transmission reliability is improved, but processing requirements increase
Solution Approach 1:
The patent merges multiple PDSCH detections into a single unified detection process for the codeblock group. Instead of independently detecting and providing feedback for each PDSCH, the UE performs combined detection and provides unified feedback, reducing processing requirements while improving reliability through joint processing
Data Source
AI summary
In one configuration, multiple TRPs, or base stations such a next generation node B (gNB) base stations send different transport blocks (TBs) to a user equipment (UE) at the same time or at different times. In another configuration, multiple base stations may send the same data at the same time to a UE. When the same data is being sent by multiple base stations to a UE, the UE must be notified by some mechanism. Disclosed herein are multiple mechanism for notifying the UE that multiple base stations will be transmitting toe same data at the same time. When there is a backhaul between a TRP and another, each TRP can choose to send the same data stream to increase the reliability of the transmission when, for example, the UE receives at a low signal-to-noise ratio (SNR).